Simultaneous Modeling of Heat and Mass Transfer of Steam-Air Mixture on a Shell and Tube Condenser Based on Film Theory

2003 ◽  
Author(s):  
Yousef Haseli ◽  
Javad M. R. Roudaki
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Control Volume ◽  
Film Theory ◽  
Outlet Temperature ◽  
Transfer Equations ◽  
Shell And Tube ◽  
Cooling Media ◽  
Tube Condenser

The idea of this work is to analyze condensation of steam-air mixture in a baffled shell and tube condenser with one path tube. Film Theory was used to consider the effects of heat and mass transfer on each other. Accordingly heat and mass transfer equations through proposed algorithm were solved simultaneously for each of baffle spacing considered as a control volume in this work. The predicted outlet temperature of both gas (air-water vapor mixture) and cooling media and total condensation rate is compared with the available experimental data taken from a typical semi-industrial condenser. A very good consistency of the analytical approach with the experimental data is achieved and presented.

A Film-Theory-Based Model for a Multicomponent Droplet Evaporation at Both Low- and High-Pressure Environments

2005 ◽  
Vol 128 (3) ◽  
pp. 290-294 ◽  
Author(s):  
Guangfa Yao
Keyword(s):  
Mass Transfer ◽  
High Pressure ◽  
Heat And Mass Transfer ◽  
Film Theory ◽  
Droplet Evaporation ◽  
Published Data ◽  
Real Gas ◽  
New Model ◽  
The Real ◽  
Transfer Equations

Modeling of a multicomponent droplet evaporation is investigated based on the film theory in both low- and high-pressure environments. Unlike the classical film theory, effects of blowing due to evaporation on gas-side heat and mass transfer are included through the film thicknesses. The corresponding gas-side heat and mass transfer equations are derived in terms of film thicknesses. In a high-pressure situation, the real gas behavior is considered. Based on the derived equations, a new model for multicomponent droplet evaporation is formulated and validated against the published data.

A Calculation Method for Analysis Condensation of a Pure Vapor in the Presence of a Noncondensable Gas on a Shell and Tube Condenser

Volume 3 ◽  
2004 ◽  
Author(s):  
Yousef Haseli ◽  
S. Javad M. Roudaki
Keyword(s):  
Mass Fraction ◽  
Control Volume ◽  
Film Theory ◽  
Theory Model ◽  
Temperature Profiles ◽  
Condensation Rate ◽  
Noncondensable Gas ◽  
Shell And Tube ◽  
Parallel Current ◽  
Tube Condenser

Based on film theory model, an approach is developed to analyze the condensation of a binary mixture, while one is non-condensable component, on a baffled shell and one path tube condenser. Using of this approach leads to have the condensation rate and both mixture and coolant temperatures at the end of each baffle spacing, which is considered as a control volume in this research. This method is checked for a set of steam-air mixture and water as coolant on a counter and a parallel current condenser. The results show that the condensation rate and temperature profiles in each condenser have consistence trend. Also comparisons of output values of both types of the condenser for different air mass fraction indicate an overall superior operation of counter type than the parallel type.

Simultaneous heat and mass transfer during evaporation from a film of liquid into the turbulent gas

1982 ◽  
Vol 47 (3) ◽  
pp. 766-775 ◽  
Author(s):  
Václav Kolář ◽  
Jan Červenka
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Driving Forces ◽  
Proper Definition ◽  
Definition Of ◽  
Simultaneous Heat ◽  
Theory And Experiment

The paper presents results obtained by processing a series of published experimental data on heat and mass transfer during evaporation of pure liquids from the free board of a liquid film into the turbulent gas phone. The data has been processed on the basis of the earlier theory of mechanism of heat and mass transfer. In spite of the fact that this process exhibits a strong Stefan's flow, the results indicate that with a proper definition of the driving forces the agreement between theory and experiment is very good.

scholarly journals Experimental studies and numerical modelling of heat and mass transfer process in shell-and-tube heat exchangers with compact arrangements of tube bundles

2018 ◽  
Vol 240 ◽  
pp. 02006 ◽  
Author(s):  
Valery Gorobets ◽  
Yurii Bohdan ◽  
Viktor Trokhaniak ◽  
Ievgen Antypov
Keyword(s):  
Mass Transfer ◽  
Numerical Modelling ◽  
Heat And Mass Transfer ◽  
Heat Exchangers ◽  
Experimental Studies ◽  
Mass Transfer Process ◽  
Experimental Investigations ◽  
Transfer Processes ◽  
Tube Bundles ◽  
Shell And Tube

Shall-and-tube heat exchangers based on the bundles with in-line or staggered arrangements have been widely used in industry and power engineering. A large number of theoretical and experimental works are devoted to study of hydrodynamic and heat transfer processes in such bundles. In that, works the basic studies of heat and mass transfer for these bundles are found. However, heat exchangers of this type can have big dimensions and mass. One of the ways to improve the weight and dimensions of the shell-and-tube heat exchangers is to use compact arrangement of tube bundles. A new design of heat exchanger is proposed, in which there are no gaps between adjacent tubes that touch each other. Different geometry of these tube bundles with displacement of adjacent tubes in the direction of transverse to the flow is considered. Numerical modelling and experimental investigations of hydrodynamic, heat and mass transfer processes in such tube bundles has been carried out. The distribution of velocities, temperatures, and pressure in inter-tube channels have been obtained.

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